Trade volume between Southwest China's Yunnan province with five countries along the Lancang-Mekong River grew by 13.4 percent year-on-year to reach 81 billion yuan ($12 billion) in 2017, customs in the provincial capital Kunming said Thursday.

Trade between Yunnan and Myanmar is about 42 billion yuan, 52 percent of the total, it said.

The Lancang-Mekong River runs through China, Myanmar, Laos, Thailand, Cambodia and Vietnam, and serves as a natural bond linking the six countries.

In 2016, a regional cooperation mechanism was established among the six countries.

Kunming customs said it had carried out cooperation with customs authorities in these countries in exchanging information, fighting against cross-border crime and in customs clearing.